h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 260

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Notes: 1. Only 0 can be written, to clear the flag.
Rev. 1.00, 05/04, page 226 of 544
Bit
4
3
2
1
0
2. When OVF is polled with the interval timer interrupt disabled, OVF = 1 must be read at
Bit Name
PSS
RST/NMI
CKS2
CKS1
CKS0
least twice.
Initial
Value
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
Description
Prescaler Select
Selects the clock source to be input to TCNT.
0: Counts the divided cycle of φ–based prescaler (PSM)
1: Counts the divided cycle of φSUB–based prescaler
Reset or NMI
Selects to request an internal reset or an NMI interrupt
when TCNT has overflowed.
0: An NMI interrupt is requested
1: An internal reset is requested
Clock Select 2 to 0
Selects the clock source to be input to TCNT. The
overflow cycle for φ = 10 MHz and φSUB = 32.768 kHz is
enclosed in parentheses.
When PSS = 0:
000: φ/2 (frequency: 51.2 µs)
001: φ/64 (frequency: 1.64 ms)
010: φ/128 (frequency: 3.28 ms)
011: φ/512 (frequency: 13.1 ms)
100: φ/2048 (frequency: 52.4 ms)
101: φ/8192 (frequency: 209.7 ms)
110: φ/32768 (frequency: 0.84 s)
111: φ/131072 (frequency: 3.36 s)
When PSS = 1:
000: φSUB/2 (cycle: 15.6 ms)
001: φSUB/4 (cycle: 31.3 ms)
010: φSUB/8 (cycle: 62.5 ms)
011: φSUB/16 (cycle: 125 ms)
100: φSUB/32 (cycle: 250 ms)
101: φSUB/64 (cycle: 500 ms)
110: φSUB/128 (cycle: 1 s)
111: φ/256 (cycle: 2 s)
(PSS)